Information system, terminal device, and information center device
a terminal device and information system technology, applied in the field of information systems, can solve the problems of not fully downloading all the necessary road map data from the information center, user may not learn where the new road connects, and the limitation of the amount of map information at a tim
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[0054]Description will be given to the effect of the above-mentioned embodiment.
[0055](1) Description will be given through comparison with the related art with reference to the explanatory drawings in FIGS. 5A and 5B and FIGS. 6A and 6B. FIG. 5A illustrates the relation between the state of roads before a road is newly opened to traffic and map blocks (hatched portions) in the possession of the automobile navigation system 20 at that time. That is, there are the following routes from a current position S (interchange 404) to a destination point G: a route going through an expressway 401 and getting it off at an interchange 405 and heading down to the destination point G; and a route going through a national highway 403 and heading down to the destination point G. It will be assumed that the automobile navigation system 20 is in possession of block maps containing these routes and roads partly related to these routes. (Refer to the hatched portions.)
[0056]It will...
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